1681659889984 has 28 divisors (see below), whose sum is σ = 3342908668500. Its totient is φ = 839352194048.

The previous prime is 1681659889979. The next prime is 1681659889991. The reversal of 1681659889984 is 4899889561861.

It can be written as a sum of positive squares in 2 ways, for example, as 556516000000 + 1125143889984 = 746000^2 + 1060728^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1681659889898 and 1681659889907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23053159 + ... + 23125990.

Almost surely, 2^{1681659889984} is an apocalyptic number.

It is an amenable number.

1681659889984 is a deficient number, since it is larger than the sum of its proper divisors (1661248778516).

1681659889984 is an equidigital number, since it uses as much as digits as its factorization.

1681659889984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46179730 (or 46179720 counting only the distinct ones).

The product of its digits is 2149908480, while the sum is 82.

The spelling of 1681659889984 in words is "one trillion, six hundred eighty-one billion, six hundred fifty-nine million, eight hundred eighty-nine thousand, nine hundred eighty-four".